Sawing apparatus.



W. E. WRIGHT.

\ SAWING APPARATUS. APPLICATION FIL ED AUG-3 l9l4- RENEWED AUG. I1, 19!]- 6 1,261,669. 6 Patented A miss.

UNITED STATES IATENT OFFICE.-

WARD E. WRIGHT, OF LAKE BLUFF, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, To PFANSTIEHL COMPANY, me, or NORTH CHICAGO, ILLINOIS, A CORPORATION on NEW YORK.

SAWING APPARATUS.

. Patented Apr, 2, 1918.

Application filed August 8, 1914, Serial No. 854,605. Renewed August 17, 1917. Serial No. 186,822.

To all whom it may concern:

Be it known that I, WARD E. WRIGHT, a citizen of the United States, residing at Lake Bluff, in the county of Lake and State of Illinois, have invented a certain new and Improved Sawing Apparatus, of which the following isa full, clear, concise, and exact description, reference being had to the accompany' gdrawings, forming a part of this specification.

My invention relates to sawing apparatus, particularly apparatus for sawin tungsten disks from the ends of tungsten r0 s, and the object of m invention is to provide an improved device of this class which may be cheaply constructed and easily operated.

Metallic tungsten is one of the group, of so-called rare metals. It fuses only at extremely high temperature and does not readily oxidize or corrode in ordinary atmospheres. It is extremely hard and cannot be cut or worked with ordinary tools. Its properties are such as to make it admirably adapted for contact points and electrical switching apparatus of various kinds, but the high cost of the tungsten itself coupled with the difliculties of working it into shape for use has in the past greatly limited, if not practically prevented, its application as a material from which to make electric contact points.

The apparatus hereinafter described in detail is particularly adapted for use in sawing tungsten disks from the ends of rods of tungsten. These tungsten disks are subsequently fused or welded to base metal backings or supports. My present invention is, however, confined to the sawing apparatus, per se.

My invention provides means for efiectually lubricating the sawing or slitting wheel forming a part of the apparatus of my invention. In the present embodiment of my invention the lubricating material is led to a point within the periphery of the wheel and is thrown outwardly by centrifugal force through suitable channels when the wheel is rotated. By eniiiployin this arran ement I am enabled to e ectua y lubricate t e wheel at all speeds. In cutting a material such as tungsten the wheel is necessarily rotated at high speed and if a stream of lubricating material be directed toward the periphery of the wheel or ifthe lower portion of the having Wheel be immersed in a quantity of lubricating material, the wheel will not be lubricated when rotated at high speed, this being due to the fact that when the wheel is so rotated the air current around the periphery of the Wheel absolutely prevents the lubrieating material from engaging the wheel. The difliculties inherent in the lubricating arrangements just mentioned are overcome by providing the lubricatin arrangement more fully hereinafter descri ed.

In the accompanying drawings illustratingrmy invention,

igure 1 is a plan view of the sawin apparatus of my invention, certain parts eing illustrated in cross-section to more clearly reveal the construction, and

Fig. 2 is an isolated elevational view of mally tends to move the carriage into engagement with the abutment 15, located in the channel 11. Fixed to the carriage 12 is a rack 16, meshing with a pinion 17 mounted upon thebase plate. An arm 18 has one end thereof fixed with respect to the pinion 17 and at its other end carries a quadrant 19 a groove 20 formed in its periphery. A cor or cable 21 has one end thereof fixed to the quadrant 19, the channel 20 in the periphery of the quadrant serving as a guide for the cord or cable. The cord or cable 21 passes over the pulley 22 and has the other end thereof attached to a suitable weight 23. It will be seen that the Weight 23 acting through the mechanism just described, nor mally tends to move the carriage 12 against the action of its retracting spring 13.

At 24 in Fi 1 I have illustrated a pin, the upper end 0 which is beveled at 25. A spring, not shown, normally holds the pin 24.- in the path of the arm 18, but the pin may bedepressed against the action of its associated spring to move it out of the path of the arm 18. It will'be seen that due to the beveled surface of the pin 24, the arm 18 may be moved to the position shown in dotted lines, Without first manually depressing the pin, due to the fact that the arm 18 upon engaging the pin will ride on the t the tungsten rod from the end of which a disk is to be sawed. The tungsten rod is. illustrated at 28. Mounted in the clamping frame 26 is a clamping member 29 having an aperture therein through which the tungsten rod 28 may be passed as illustrated, and threaded upon the clamping member 29 is a clamping nut 30 which may be turned to clamp the tungsten rod in the position illustrated in the drawings.

Mountedat 31 is a gage 32 having an end 33 of substantially the thickness of the disks to be sawed from the end of the tungsten rod carried by the clamping frame. Pivotally mounted at 34 is a stop 35 provided with a handle 36 at one end thereof. The other end of the stop 35 is provided with an adjusting screw 36 serving as an abutment for the end of the tungsten rod.

Supported by the common base plate 10 is a rotatable spindle 37 mounted in a suitable frame 38. A belt passing over a pulley 39 serves to rotate the. spindle 37 upon the end of which is mounted the saw or slitting- Wheel 40 to be presently and fully described.

The free end of the spindle 37 is provided with a reduced threaded end 41 upon which the saw or slitting tool 40 is adapted to be mounted. The saw or slittin tool is clamped in operative position etween a pair of disks, 42, 42, one disposed on each side of the saw or slitting tool. The parts just mentioned are retained in position by means of a nut 43 provided in turn with a suitable lock-nut 44. Formed in the spindle 37 is a bore 45 into which projects a tube 46 supported by the base plate 10 and having communication through a stop cock 48 and suitable pipe connections with a source of lubricating material, Each of the disks 42. is provided at its inner periphery with an annular groove 42* and extending from the groove 42 to the outer periphery of the clamping disk are grooves 42 which, when the clamping disks are in position, as illustrated in the drawings, form channels for lubricating material. Passages 49, 49 formed in the reduced end of the spindle 37 afford communication between the bore 45 and the grooves 42 It will be seen that when the sawing or slitting tool is rotated lubricating material will be thrown out through the channels 42 by centrifugal force to lubricate the sawing or slitting tool and the tungsten rodfrom which a d1sk is to be sawed.

While in the accompanying drawings I have shown radial channels through which the lubricating material is thrown outwardly to the periphery of the wheel, I wish to have it understood that the channels need not necessarily be radial, the onl requirement being that there be provide passages afi'ording communication between the source of lubricating supply and the points to be lubricated in order that the lubricating material may be thrown outwardly by centrifugal force when the wheel is rotated.

When a tungsten rod is clamped in the position shown in Fig. 1 and when the carriage 12 is in retracted position the pin 24 is depressed to permit the weight 23 to advance the carriage. The tungsten rod 28 is then moved into enga ement with the saw or slitting tool and a disk is sawed from the end of the tungsten rod. Inasmuch as force is applied to the carriage 12 during the sawing or slittingoperation, the saw or slitting tool passes clearly through the tungsten rod and does not form a bur on the rod or disk as would otherwise be the case. After the completion of the sawing or slitting operation the carriage 12 is retracted and the stop 35 is operated to permit the tungsten disk to drop from the aperture in the end 33 of the gage 32. The tungsten rod is then advanced and clampedin position and the operation just described is repeated.

In passing I Will say that the sawing or slitting tool before mentioned is extremely thin, and is preferably formed by mixing.

rubber, gum, sulfur and granules of abrasive material, forming the mlxture into a disk of substantially uniform thickness and coating the surface of the disk with a mixture of glassy binder and an abrasive in granular form,

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is 1. Apparatus of the class described, comprising a rotatable spindle, a cutting tool carried by said spindle, plates for retaining said cuttmg tool in operative position, radial grooves in said plates and means for supplying lubricating material to the inner ends of said radial grooves whereby the lubricating material is thrown outwardly by centrifugal force when the spindle is rotatcd.

2. Apparatus of the class described comprising a rotatable spindle arranged to carry an abrasive disk, a clamping plate for retaining the abrasive disk in operative pomeans for supply plate'and means for supplying lubricatfig material to the inner ends of said radial channels.

3. Apparatus of the class described, com prising a rotatable spindle, arranged to carry a cutting tool, a plate for clam said cutting tool in operative position, sai plate conformed to form an annular channel between the spindle and plate, radial channels in said plate led from said annu-- lar channel to the periphery of'the plate and g lubricating material .to said annular channel.

4. Apparatus of the class described, comprising a rotatable spindle arranged to carry a cutting tool, a plate for clamping said cutting tool in operative position radial grooves in said I plate, a longitudinal bore 111 said spindle, means forsupplying. a lubricating material to said longitudinal bore and means for afiordin communication between said bore and sa1 grooves.

5. Apparatus of the class described comprisin a rotatable spindle, -a cutting disk carried by said s indle, a space within the spindle, means or supp] lubricating material to said space, and a plurality of radial channels leading from said space to points immediately adjacent the periphery of said cutting disk whereby lubricating material is, by centrifugal force, thrown'outwardly to the periphery of the disk when the spindle is rotated. I

In witness whereof, I hereunto subscribe my name this 30th day of July, A. D. 1914.

Witnesses:

G. L. BREWSTER, L. H. Busrmm.

WARD E. WRIGHT. 

